OEM CNC Machined Precision Casting

Tolerance standard: VDG P690 T1 VDG P690 D1 ISO2768mK ss should always be removed by correct engineering practices to reduce part weight. We perform a 100% visual inspection, However, if dimensional verification is required, a sampling plan and process control is less expensive than 100% gaging...

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1. Carbon & Alloy Steel:
1) molding process:	Resin sand casting /Precision/Investment/Loss wax /Fast Forming/RP investment casting/Forging
2) Material:	----EN 10293 GE200/DIN1681 GS38 ----EN 10293 GE240/DIN1681 GS45 ----EN 10293 GE300/DIN1681 GS5216Mn,25Mn,34CrMo,42CrMo4…
3) Industry involved:	Twist lock for container locking, Specified container corner casting, non-standard forging draw bar weighted 31kgs, Dia.300 Bolted joints of space grid structure.
4) Part unit weight range:	Resin sand casting from 50kgs up to Chinese loss wax from 0.01 up to 100kgs, Japanese loss wax from 0.001up to 80kgs. Close die Forging up to 30kgs
5) Max/Min wall thickness requirements:
6) Manufacturer Certification:	ISO9001(2000)/ TS16949

2. Stainless steel:
1) molding process:	Precision/Investment/Loss wax/ Centrifugal Casting
2) Material:	CF8, CF8M, CF3, CF3M
3) Industry involved:	Impellers for aero industry Centrifugal tubes with OD670/L=4.5m/W=1.5tons
4) Part unit weight range:	Japanese loss wax from 0.001up to 80kgs. Centrifugal tubes up to 1500kgs
5) Max/Min wall thickness requirements:
6) Manufacturer Certification:	ISO9001(2000)/ TS16949

Tolerance standard:

VDG P690 T1 VDG P690 D1

ISO2768mK

dimension	tolerance	dimension	tolerance
<6	±0.25	<6	±0.15
6to10	±0.3	6to10	±0.18
10to18	±0.35	10to18	±0.22
18to30	±0.4	18to30	±0.26
30to50	±0.5	30to50	±0.4
50to80	±0.75	50to80	±0.45
80to120	±0.85	80to120	±0.55
120to180	±1.0	120to180	±0.8
180to250	±1.2	180to250	±1.2
250to315	±1.6	250to315	±1.3
315to400	±1.8	315to400	±1.8
400to500	±2.0	400to500	±2.0
500to630	±2.7	500to630	±2.7
630to800	±3.1	630to80	±3.1
800to1000	±3.6	800to1000	±3.6

ss should always be removed by correct engineering practices to reduce part weight.

Items	Size	Premium
Outline Dimention	1000×620×380	up to 100
Weight(kgs)	0.001-60	0.10 to 1.50
Min. Wall Thickness	0.50	5 to 10

We perform a 100% visual inspection, However, if dimensional verification is required, a sampling plan and process control is less expensive than 100% gaging of each part. Fixed gages such as "go-no-go" are less expensive to use than gages with dial indicators. (Important: Whenever custom gages are used, there should be identical gages at WOTECH and at the customer's plant.)
Non-destructive Testing
All sample investment castings are non-destructively tested in order to establish first article quality. However, this is generally not required on production commercial investment castings; doing so will add costs. The following non-destructive tests are listed from least to greatest cost:
1. Magnetic Particle
2. Fluid Penetrant
3. X-Ray
Certification
Chemical Certification can be provided at no extra cost. Mechanical Property Certification adds to cost, so it's best to consider a combination of Chemistry and Hardness Certification instead. Marking each casting with heat number also adds to the cost. Investment casting in lot numbers may be a good tracability option for commercial parts.
Tooling & Cavities
If the design contains features that will raise scrap or rework rates (and the piece price), the WOTECH Estimating Engineer will recommend design modifications to keep the piece price down.
More cavities means higher tooling cost, but lower piece price. Configurations that do not allow metal cores to be drawn must be treated in one of the following ways:
1. Collapsible Cores – Lowest piece price, higher tooling cost.
2. Loose inserts – Best for low volume parts.
3. Multipiece Wax Assemblies – Best for certain configurations, but tolerance control suffers.
4. Soluble Cores – Requires additional die and labor.
5. Pre-Formed Ceramic Cores – High cost for specialized shapes.
Alloy Grade
Alloys are listed from least to greatest cost:
1. Carbon and Low Alloy Steels
8620, 4140, 1020, 1035are best choices
2. 17-4PH and 400 Series Stainless Steel
17-4PH & CA-15 (410) are most frequently poured
Do not specify 416 unless necessary for machinability
3. 300 Series Stainless Steel
CF-8 (304), CF-8M (316) are best choices
Do not specify CF-16F (303) unless necessary for machinability
4. Tool Steels
Costs vary widely depending on grade
5. Nickel Base Alloys
Alloy C and X are best choices
6. Cobalt Base Alloys
All grades pour well – Choice is based on end use and cost
7 Heat resistant steel
SCH13,SCH22,SCH24,IN519,NW-22,NA22H

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